Re: Time Libraries Rough Draft

Ashley Yakeley wrote:

In article <87k6pgacrj.fsf@sefirot.ii.uib.no>, Ketil Malde wrote:

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* UTC arithmetic * types or type-synonyms for Julian days and dates (for UT1) * getting the current UTC time

(I'd call these -- anything that maps SI seconds to other structures, really -- calendars, but I guess I've said so enough times already :-)

I see a calendar as something that maps UTCTime to other structures.

I still think a calendar only makes sense mapping TAI time to other structures, including UTC time. There really are good reasons that other systems have implemented it this way. The bias should be towards implementing the structures in the way that those who have studied the problem at great length have concluded. UTC time itself may, or may not, in any given instant, be corrected at those times when correction is needed. The simple fact that UTC time is not monotonically increasing causes a whole host of difficulties. I see no advantage to not only reinventing this wheel, but in using a different wheel.